Your baby this week
Your baby is getting chubbier. There's less room, but movements shouldn't fade; they may feel different, yet they should keep up the usual pattern.
At 35 weeks your baby is filling out fast, with fat building up around the shoulders, arms and legs. The kidneys are fully developed, and the liver can process some waste products. Movements may feel different as space runs out, but they shouldn't become less frequent; that stays true right up to labor. Between 36 and 37 weeks you'll be offered a group B strep (GBS) swab; if it's positive, you'll get antibiotics during labor to protect your baby. For you, pressure low in the pelvis may increase, and bathroom trips may get even more frequent. Review your birth preferences with your provider.
By the numbers
Week 35 covers days 245 to 251 counted from the first day of your last period, which is 88% of a 40-week pregnancy. About 35 days remain until a 40-week due date. Since last week, an average baby gains about 7.8 oz (220 g). By date of conception, your baby is about 33 weeks old.
Pregnancy is dated from the first day of your last period, so conception happens around week 2. Your due date is 280 days (40 weeks) from that day, and an early ultrasound may adjust it.
Your body
If movements change or stop, call labor and delivery right away, day or night. Frequent peeing and breathlessness are common now.
Tests and to-dos this week
From 36 weeks, visits are usually weekly. Ask your provider when to call and when to come in once contractions start.
Tdap (whooping cough) vaccine · weeks 27–36 · vaccine
Recommended during each pregnancy, preferably early in this window.
RSV vaccine (September–January) · weeks 32–36 · vaccine
Or your baby can get an RSV antibody shot after birth instead; ask your provider which option fits.
Coming up: Group B strep (GBS) test (from week 36). Full prenatal visit schedule
Tips for the third trimester
- From 28 weeks, go to sleep on your side; if you wake on your back, just roll over.
- Pack your hospital bag and agree with your provider on when to head in.
- Call right away, even at night, if your baby moves less or differently.
- Know the signs of labor: regular, strengthening contractions, your water breaking or a bloody show.
Call your provider or labor and delivery right away if you have:
- your baby is moving less or differently than usual
- your water breaks, especially if the fluid is green, brown or smells bad
- bright red bleeding or constant, severe belly pain
- a severe headache, vision changes, pain under the ribs or sudden swelling
- intense itching, especially on the palms and soles
In an emergency, call 911.
Last week and next week
Last week (34): Space is getting tight, so your baby stays curled up.
Frequently asked questions
How big is the baby at 35 weeks?
About the size of a head of romaine: about 18.1 in (46 cm) · 5.6 lb (2,530 g), measured head to heel. These are rounded averages, and every baby grows at their own pace.
How many months is 35 weeks pregnant?
35 weeks is in month 8 and the third trimester. About 5 weeks (35 days) remain until a 40-week due date. Months are approximate; providers count weeks and days.
What is the group B strep test?
Group B strep is a common bacteria that usually causes no symptoms but can pass to a baby during birth. A vaginal and rectal swab is taken at 36 to 37 weeks; if positive, you'll get antibiotics during labor.
What's the next test or appointment after week 35?
Next up: Group B strep (GBS) test, from week 36. Your provider may schedule things differently depending on your health and local practice.
Sources
- WHO Fetal Growth Charts (Kiserud et al., PLoS Med 2017)
- INTERGROWTH-21st crown-rump length standard (Papageorghiou et al., 2014)
- Hadlock et al.: In utero fetal weight standard (Radiology 1991)
- NHS: Week-by-week guide to pregnancy
- NHS: Pregnancy symptoms you need to get help for
- ACOG: How Your Fetus Grows During Pregnancy
- ACOG: Routine Tests During Pregnancy
- ACOG: Prenatal Genetic Screening Tests
- CDC: Vaccine Recommendations Before, During, and After Pregnancy
- Office on Women's Health: Prenatal care and tests
- Hungarian Decree 26/2014 (IV. 8.) EMMI on prenatal care
- NNGYK (Hungary): 2026 vaccination methodology letter
- ACOG – Group B Strep and Pregnancy (Committee Opinion 797)
- ACOG – The Rh Factor
Last reviewed: November 14, 2026 · Kitpebble editorial team
This page is for general information. It isn't medical advice or a diagnosis and doesn't replace your OB-GYN or midwife. Sizes are rounded averages. Our editorial policy